1. Personal Publishing
1.1. Blogging
1.2. Podcasting
2. Media Sharing
2.1. Flickr
2.2. Koinup
2.3. YouTube
2.4. VodPod
2.5. Vimeo
3. Social Networking
3.1. Facebook
3.2. Plurk
3.3. Twitter
3.4. Ning
3.5. LinkedIn
4. Web Platforms
4.1. Shopping Sites
4.1.1. Individual
4.1.1.1. Hippo
4.1.2. Open
4.1.2.1. Apez
4.1.2.2. Xstreet
4.1.2.3. Slapt
4.1.2.4. Metalife
4.2. Social Sites
4.2.1. Designer Showcase Network
4.2.2. MetaMoo
4.2.3. AVMatch
4.2.4. Forums
4.2.4.1. SL Universe
4.2.4.2. SLInside
4.2.5. Wikis
4.2.5.1. SL Wikia
5. Meetaverse
6. Species Morphing
6.1. Dragons
6.2. Furries
6.3. Nekos
6.4. Tinies
7. Academic
7.1. Librarians
7.2. Sociologists
7.3. Educationalists
8. Literary
8.1. Library Systems
9. Arts
9.1. Art
9.1.1. Photography
9.1.2. Sculpture
9.1.3. Digital Art
9.2. Machinima
9.3. Music
9.3.1. DJ
9.3.2. Performance
9.3.3. Internet Radio
9.4. Theater
9.5. Broadcast Drama
9.6. Live TV
9.6.1. Business
9.6.2. Entertainment
9.7. Newspapers/Magazines
9.8. Drawing & Painting
10. Building/Scripting
11. Corporate
11.1. Research VW's
11.2. Global Collaboration
11.3. Marketing
12. Griefing
12.1. Trolling
13. Nationality
14. Professional
14.1. Architectural
14.2. Medical
14.3. Scientific
15. Religious
15.1. Buddhist
15.1.1. Multidenominational
15.1.2. Traditionalist
16. SL Business
16.1. Retail
16.1.1. Fashion
16.1.1.1. Skins
16.1.1.2. Hair
16.1.1.3. Clothing
16.1.1.4. Shoes
16.1.2. Avatars
16.1.3. Vehicles
16.1.4. Weapons
16.1.5. Home & Garden
16.1.5.1. Furniture
16.1.5.2. Buildings
16.1.5.3. Plants
16.1.5.4. Animals
16.2. Services
16.2.1. Scripting
16.2.2. Marketing
16.2.2.1. Translations :-)
16.2.3. Design
16.2.4. Escorts
16.2.5. Real Estate
16.2.5.1. Mainland
16.2.5.2. Estate
16.2.5.3. Apartments
17. Sexual Preference
17.1. BDSM
17.2. GLBT
17.3. Misc. Fetish
18. Technology Extenders
18.1. Client coders
18.1.1. RLV
18.2. OpenSimulator
18.3. Bot Builders
19. Alternative Communication
19.1. GTalk
19.2. AIM
19.3. Skype
19.4. iPhone Apps
19.4.1. TouchLife
19.4.2. Sparkle
20. Support Groups
20.1. AA in SL
21. Non-Profit
21.1. Volunteerism
21.2. Outreach
21.3. Advocacy
21.4. Fund-raising
21.5. Philanthropic
21.5.1. NCI
22. Government
22.1. Federal
22.1.1. Military
22.1.1.1. Recruitment
22.1.1.2. Training
22.1.1.3. Family Outreach/Support
22.1.2. Civilian
22.1.2.1. DOE
22.1.2.2. NASA
22.2. State
22.3. Local
23. Gamers
23.1. Fantasy
23.1.1. Based on Fictional Work
23.1.2. High Fantasy
23.1.3. Steampunk
23.1.4. Urban
23.2. Role Playing
23.2.1. Gaming
23.2.2. Historical
23.2.3. Sexual
23.2.4. Family
23.3. SL Sports
23.3.1. Flying
23.3.2. Sailing
23.3.3. Surfing